A 1200 kg car moving 12 m/s collides with an 1800 kg car moving at 8 m/s in the opposite direction. After the collision the two cars stick together and move as one. A. Calculate the velocity of the two cars after the collision. B. Calculate the impulse acting on both vehicles. C. If the change in momentum took 0.8 seconds calculate the average force acting on both vehicles. D. Calculate the amount of Energy lost in the collision.